[Bug rtl-optimization/108461] '-fcompare-debug' failure (length) w/ -mcpu=e500mc -O2 -ftrapv -fno-expensive-optimizations -fno-guess-branch-probability -fno-tree-dce -fno-tree-dse

[asolokha at gmx dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108461

--- Comment #2 from Arseny Solokha <asolokha at gmx dot com> ---
Created attachment 54540
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54540&action=edit
gkd diff #2

I believe this simpler testcase demonstrates the same issue.

long long int m, n;

void
foo (void)
{
  if (m)
    m = 0;

  n = m = 0;
}

% powerpc-e300c3-linux-gnu-gcc-13 -mcpu=8540 -O2 -fcompare-debug
-fno-expensive-optimizations -fno-tree-dse -c fqrz27ap.c
powerpc-e300c3-linux-gnu-gcc-13: error: fqrz27ap.c: '-fcompare-debug' failure
(length)